The latest study showed that NO and NOS are widely distributed in male reproductive system.NOS is mainly distributed in Leydig′s cells and sertoli′s cells and a minor portion in spermatogenous cells. 最近研究表明,NO及NOS在雄性生殖系统分布广泛,NOS主要分布于睾丸间质细胞、支持细胞,少量分布于生精细胞。